The nurse is assessing a client who has a history of kidney stones and returns to the clinic with flank pain. Which intervention should the nurse implement first?

Choice A rationale: While straining urine for stones is a critical diagnostic and monitoring intervention for a client with suspected nephrolithiasis, it is not the priority action. The nurse must first assess the client's current physiological state, specifically their level of pain, before performing task-oriented interventions like specimen collection. Choice B rationale: Observing for nonverbal cues (such as grimacing or guarding) is an important component of assessment, especially if a client is unable to communicate. However, for a verbal adult client, the "gold standard" of pain assessment is the client's self-report using a validated, objective tool. Choice C rationale: The first step in the nursing process is assessment. When a client presents with a primary complaint of pain, the nurse must objectively quantify that pain using a standardized scale (such as the 0 to 10 scale) and assess its characteristics (location, quality, radiation). This baseline data is essential for determining the urgency of care and evaluating the effectiveness of future interventions. Choice D rationale: Asking about home medication use is part of the health history and is necessary to prevent drug-drug interactions or medication errors. However, this follows the immediate assessment of the client's current pain level and physical status.